[Openid-specs-ab] Issue #1788: OpenID4VCI: invalid_or_missing_proof (openid/connect)

[Takahiko Kawasaki]

New issue 1788: OpenID4VCI: invalid_or_missing_proof
https://bitbucket.org/openid/connect/issues/1788/openid4vci-invalid_or_missing_proof

Takahiko Kawasaki:

The section of “[Credential Error Response](https://openid.net/specs/openid-4-verifiable-credential-issuance-1_0.html#name-credential-error-response)” in OpenID for Verifiable Credential Issuance draft 10 defines the `invalid_or_missing_proof` error code, but the name is clumsy. How about dividing the error code into the following two error codes \(or something else\)?

* `invalid_proof`
* `missing_proof`

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